On this day: February 14

Saint Valentine dies a martyr, President Polk has his picture snapped, Al Capone sends his foes a violent Valentine's Day message, and Jackie Kennedy invites TV viewers inside the White House, all on this day.

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Toni Barros/Wikimedia Commons

2003: Dolly the sheep, the first mammal cloned from an adult in 1996, is put to death at age 6 because she had a progressive lung disease and severe arthritis.

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